Hydraulic pipeline structure from main valve to boom cylinder of excavator

Abstract

The utility model discloses a hydraulic pipeline structure from a main valve to a movable arm oil cylinder of an excavator, and belongs to the technical field of engineering machinery. The defects that in the prior art, the distance between a traditional steel pipe transited from a main valve to the front end of a frame is too long, high-pressure impact of movable arm movement easily causes violent vibration of the steel pipe, and therefore stability and reliability are affected are overcome. A main body structure of the hydraulic system comprises a main valve and a movable arm oil cylinder, the main valve is connected with the movable arm oil cylinder through a pipeline assembly from the main valve to the movable arm oil cylinder and a movable arm oil cylinder pipeline, and the pipeline assembly from the main valve to the movable arm oil cylinder comprises a fixed support, a movable arm oil cylinder small cavity oil path block and a movable arm oil cylinder large cavity oil path block. A movable arm oil cylinder small cavity oil port of the main valve is communicated with a seventh oil port in a movable arm oil cylinder small cavity oil path block through a movable arm oil cylinder small cavity steel pipe and a movable arm oil cylinder small cavity rubber pipe, and a movable arm oil cylinder large cavity oil port of the main valve is communicated with a first oil port in a movable arm oil cylinder large cavity oil path block through a movable arm oil cylinder large cavity steel pipe and a movable arm oil cylinder large cavity rubber pipe. The utility model is mainly applied to engineering machinery such as excavators and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a hydraulic pipeline structure from a main valve to a boom oil cylinder of an excavator. Background Art

[0002] During a complete operating cycle of an excavator, boom lifting and lowering accounts for a very high proportion. In order to control the boom cylinder, the pressure oil output by the main valve needs to be transported to the oil port of the boom cylinder through the hydraulic pipeline. However, the rationality of the hydraulic pipeline structure and layout seriously affects the reliability of the entire machine.

[0003] The existing technical solutions for the pipeline structure from the main valve to the boom cylinder of the excavator are as follows: Figure 12 As shown, the overall piping solution includes the vehicle frame, main valve, main valve-to-boom cylinder piping, boom cylinder, and piping assembly. The main valve is mounted on the vehicle frame, and the two boom cylinders are hinged at the front of the frame. The boom cylinder piping is installed on the boom cylinders. One end of the main valve-to-boom cylinder piping is connected to the main valve oil port, and the other end is connected to the boom cylinder piping, acting as a bridge. The main valve-to-boom cylinder piping consists of the boom cylinder large-bore piping assembly, the boom cylinder small-bore piping assembly, and a fixed pipe clamp. The boom cylinder piping consists of steel pipe, four hydraulic hoses, and two steel pipe clamps. The boom cylinder large cavity pipeline assembly in the main valve to boom cylinder pipeline is welded together by three sections of steel pipe sub-components and welded joints. The oil inlet end of the large cavity steel pipe is connected to the boom cylinder large cavity oil port of the main valve, and the pressure oil at its two output ends is respectively delivered to the large cavity oil ports of the two boom cylinders through a hose and a steel pipe. The boom cylinder small cavity pipeline assembly in the main valve to boom cylinder pipeline is welded together by three sections of steel pipe sub-components and welded three-way joints. The oil inlet end of the small cavity steel pipe is connected to the boom cylinder small cavity oil port of the main valve, and the pressure oil at its two output ends is respectively delivered to the small cavity oil ports of the two boom cylinders through a hose and a steel pipe. However, the above solution has the following shortcomings:

[0004] 1. The existing excavator main valve to boom cylinder pipeline structure uses a steel pipe to transition from the main valve to the front end of the frame. Due to the long distance, the high-pressure impact of boom movement and the harsh working environment of the excavator, the steel pipe will vibrate violently, affecting stability and reliability.

[0005] 2. The insufficient strength of the stress concentration point at the fillet of the welded tee joint of the steel pipe assembly and the insufficient elastic fixing strength at the front end cause fatigue cracking at the welding position, resulting in oil leakage of the steel pipe. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a hydraulic pipeline structure from a main valve to a boom oil cylinder of an excavator.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A hydraulic pipeline structure from a main valve to a boom cylinder of an excavator comprises a main valve mounted on a vehicle frame and a boom cylinder hinged at the front end of the vehicle frame, wherein the main valve is connected to the boom cylinder via a main valve to boom cylinder pipeline assembly and a boom cylinder pipeline, the main valve to boom cylinder pipeline assembly comprises a fixed bracket mounted on the vehicle frame, a boom cylinder small-cavity oil passage block mounted on the fixed bracket, and a boom cylinder large-cavity oil passage block mounted on the boom cylinder small-cavity oil passage block, the boom cylinder small-cavity oil port of the main valve is connected to oil port seven on the boom cylinder small-cavity oil passage block via a boom cylinder small-cavity steel pipe and a boom cylinder small-cavity rubber hose, and the boom cylinder large-cavity oil port of the main valve is connected to oil port one on the boom cylinder large-cavity oil passage block via a boom cylinder large-cavity steel pipe and a boom cylinder large-cavity rubber hose.

[0009] Preferably, the boom cylinder large-cavity oil passage block is provided with oil port two and oil port three, oil port two is connected with the large-cavity oil port of the left boom cylinder through the boom cylinder pipeline, oil port three is connected with the large-cavity oil port of the right boom cylinder through the boom cylinder pipeline, and oil port one, oil port two and oil port three are connected through the internal oil channel.

[0010] Preferably, the large-cavity oil passage block of the boom cylinder is also provided with a countersunk hole for installation on the small-cavity oil passage block of the boom cylinder, a hoisting hole for hoisting, and a threaded hole for fixing the end of the hose and the oil port.

[0011] Preferably, the boom cylinder small chamber oil circuit block is provided with oil port five and oil port six, oil port five is connected with the small chamber oil port of the right boom cylinder through the boom cylinder pipeline, and oil port six is ​​connected with the small chamber oil port of the left boom cylinder through the boom cylinder pipeline.

[0012] Preferably, the small-cavity oil passage block of the boom oil cylinder is further provided with a fixing hole and a second threaded hole for fixing the end of the hose and the oil port.

[0013] Preferably, the small-cavity steel pipe of the boom cylinder and the large-cavity steel pipe of the boom cylinder are fixed on the vehicle frame by steel pipe fixing clamps.

[0014] Preferably, the large-cavity rubber hose of the boom cylinder and the small-cavity rubber hose of the boom cylinder are installed and fixed on the vehicle frame through rubber hose clamps.

[0015] Preferably, the fixing bracket is fixed to the bottom plate of the vehicle frame by fixing bolts and washers.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The pipeline from the main valve to the boom cylinder adopts the transition form of steel pipe + hose + superimposed oil block, eliminating the three-way welding joint of the steel pipe assembly in the existing technology, solving the problem of steel pipe cracking and oil leakage, and improving the reliability and safety of the pipeline connection;

[0018] 2. Since the pipeline from the main valve to the boom cylinder is mainly connected by high-pressure hoses, the flexible connection is conducive to absorbing pressure shocks and high-pressure vibrations, which can reduce the phenomenon of pressure holding and twisting. At the same time, the hose connection facilitates assembly and improves efficiency;

[0019] 3. The piping system is securely mounted on the vehicle frame through fixing brackets, steel pipe fixing clamps, rubber pipe clamps and other components, facilitating daily inspection and maintenance while preventing wear or damage caused by vibration or movement.

[0020] 4. Multiple oil ports on the oil block are connected through internal oil channels, which simplifies the layout of external pipelines, making the entire hydraulic system more compact and reasonable, saving space and facilitating the overall design and assembly of the equipment;

[0021] 5. The large-cavity oil block of the boom cylinder is equipped with lifting holes, which facilitates the lifting operation of the components during the assembly process and also facilitates the handling and transportation of the equipment;

[0022] 6. By using threaded holes to fix the hose ends, a tight connection between the hose and the oil port is ensured, preventing potential safety hazards caused by looseness and further ensuring the personal safety of operators;

[0023] 7. The integrated oil block design not only optimizes the fluid path and reduces pressure loss, but also improves the response speed and efficiency of the hydraulic system, thereby improving the working performance of the excavator;

[0024] To sum up, the utility model ensures the stable and safe operation of the excavator during construction, solves the problem of pipeline shaking caused by pressure buildup or pressure shock during arm movement, eliminates the quality risks of high-pressure steel pipe welding tees, achieves the improvement of hydraulic system performance, simplifies the assembly process, and enhances the safety and convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the main view of the utility model;

[0026] Figure 2 It is a structural diagram of the utility model;

[0027] Figure 3 This is a structural diagram of the large-cavity oil circuit block of the boom cylinder in the utility model;

[0028] Figure 4 This is a schematic diagram of the internal structure of the large-cavity oil block of the boom cylinder in the utility model;

[0029] Figure 5 for Figure 4 Schematic diagram of the large-cavity oil passage block of the middle boom cylinder in direction A;

[0030] Figure 6 for Figure 5 Cross-sectional view of CC;

[0031] Figure 7 This is a structural diagram of the small-chamber oil circuit block of the boom cylinder in the utility model;

[0032] Figure 8 This is a schematic diagram of the internal structure of the small-cavity oil circuit block of the boom cylinder in the utility model;

[0033] Figure 9 for Figure 8 D-direction schematic diagram of the small-chamber oil passage block of the middle boom cylinder;

[0034] Figure 10 for Figure 9 Cross-sectional view of the middle BB;

[0035] Figure 11 This is a structural diagram of the installation of the fixed bracket, the small-cavity oil block of the boom cylinder, and the large-cavity oil block of the boom cylinder in the present invention;

[0036] Figure 12 This is a schematic diagram of the existing excavator main valve to boom cylinder pipeline structure.

[0037] Figure: 1. Vehicle frame; 2. Main valve; 3. Main valve to boom cylinder pipeline assembly; 4. Boom cylinder pipeline; 5. Left boom cylinder; 6. Right boom cylinder; 31. Boom cylinder small-cavity steel pipe; 32. Boom cylinder large-cavity steel pipe; 33. Steel pipe fixing clamp; 34. Boom cylinder large-cavity rubber hose; 35. Boom cylinder small-cavity rubber hose; 36. Rubber hose clamp; 37. Fixing bracket; 38. Boom cylinder Small-cavity oil circuit block; 39. Large-cavity oil circuit block for boom cylinder; 310. Fixing bolt; 311. Gasket; 381. Oil port seven; 382. Oil port five; 383. Oil port six; 384. Threaded hole two; 385. Fixing hole; 391. Oil port one; 392. Oil port two; 393. Oil port three; 394. Oil port four; 395. Countersunk hole; 396. Lifting hole; 397. Threaded hole one. DETAILED DESCRIPTION

[0038] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0039] Example 1:

[0040] like Figure 1-2As shown, a hydraulic pipeline structure from the main valve to the boom cylinder of an excavator includes a main valve 2 mounted on a frame 1 and a boom cylinder hinged at the front end of the frame 1. The main valve 2 is connected to the boom cylinder through a main valve to boom cylinder pipeline assembly 3 and a boom cylinder pipeline 4. The main valve to boom cylinder pipeline assembly 3 includes a fixed bracket 37 mounted on the frame 1, a boom cylinder small chamber oil block 38 mounted on the fixed bracket 37 by bolts, and a boom cylinder small chamber oil block 38 mounted on the fixed bracket 37 by screws. The boom cylinder large cavity oil passage block 39 is bolted to the boom cylinder small cavity oil passage block 38. The boom cylinder small cavity oil port of the main valve 2 is connected to the oil port 7 381 on the boom cylinder small cavity oil passage block 38 through the boom cylinder small cavity steel pipe 31 and the boom cylinder small cavity rubber hose 35. The boom cylinder large cavity oil port of the main valve 2 is connected to the oil port 1 391 on the boom cylinder large cavity oil passage block 39 through the boom cylinder large cavity steel pipe 32 and the boom cylinder large cavity rubber hose 34. Among them, the boom cylinder includes the left boom cylinder 5 and the right boom cylinder 6.

[0041] Specifically, the main valve 2 is installed on the frame 1, the left boom cylinder 5 and the right boom cylinder 6 are hinged at the front end of the frame 1, the boom cylinder pipeline 4 is installed on the boom cylinder, and one end of the main valve to boom cylinder pipeline assembly 3 is connected to the oil port of the main valve 2, and the other end is connected to the boom cylinder pipeline 4, which acts as a bridge or transition connection. The boom cylinder large cavity hose 34 is connected between the boom cylinder large cavity steel pipe 32 and the boom cylinder large cavity oil circuit block 39, the input end of the boom cylinder small cavity steel pipe 31 is connected to the boom cylinder small cavity oil port of the main valve 2, and the input end of the boom cylinder large cavity steel pipe 32 is connected to the boom cylinder large cavity oil port of the main valve 2; the boom cylinder small cavity hose 35 is connected between the boom cylinder small cavity steel pipe 31 and the boom cylinder small cavity oil circuit block 38, one end of the boom cylinder small cavity hose 35 is connected to the output port of the boom cylinder small cavity steel pipe 31, and the other end is connected to the oil port 7 381 of the boom cylinder small cavity oil circuit block 38.

[0042] Example 2:

[0043] like Figure 3-6 As shown, a hydraulic pipeline structure from the main valve of an excavator to the boom cylinder is different from that of Example 1 in that the boom cylinder large-cavity oil circuit block 39 is provided with oil port 1 391, oil port 2 392, oil port 393, oil port 4 394, a countersunk hole 395 for mounting on the boom cylinder small-cavity oil circuit block 38, a hoisting hole 396 for hoisting, and a threaded hole 1 397 for fixing the hose end and the oil port. Oil port 2 392 is connected to the large-cavity oil port of the left boom cylinder 5 through the boom cylinder pipeline 4, and oil port 3 393 is connected to the large-cavity oil port of the right boom cylinder 6 through the boom cylinder pipeline 4, and oil port 1 391, oil port 2 392 and oil port 3 393 are connected through an internal oil channel. Oil port 4 394 is blocked under normal circumstances. If the main valve 2 adds a boom connecting oil port, it can be connected for merging.

[0044] Specifically, the boom cylinder large cavity oil passage block 39 can transmit the pressure oil delivered by the large cavity oil port of the main valve 2 to the boom cylinder large cavity oil port. The boom cylinder large cavity oil passage block 39 has a rectangular shape. Oil port 1 391 is at the back of the boom cylinder large cavity oil passage block 39, and oil port 2 392 and oil port 3 393 are respectively on the two sides of the boom cylinder large cavity oil passage block 39. The upper surface of the boom cylinder large cavity oil passage block 39 is provided with two lifting holes 396 to facilitate its lifting. The upper surface of the boom cylinder large cavity oil passage block 39 is provided with four countersunk holes 395 for fixing it to the boom cylinder small cavity oil passage block 38. The boom cylinder large cavity oil passage block 39 is provided with 12 threaded holes 397 on the surface where each oil port is located, which are used to fix the connection between the end of the hose and the oil port.

[0045] like Figure 7-10 As shown, the boom cylinder small cavity oil passage block 38 is provided with oil port seven 381, oil port five 382, ​​oil port six 383, a fixing hole 385 and a threaded hole two 384 for fixing the hose end and the oil port. The oil port five 382 is connected to the small cavity oil port of the right boom cylinder 6 through the boom cylinder pipeline 4, and the oil port six 383 is connected to the small cavity oil port of the left boom cylinder 5 through the boom cylinder pipeline 4.

[0046] Specifically, the boom cylinder small cavity oil passage block 38 can transmit the pressure oil delivered by the small cavity oil port of the main valve 2 to the boom cylinder small cavity oil port. The boom cylinder small cavity oil passage block 38 has a rectangular shape, with oil port seven 381 on the side of the boom cylinder small cavity oil passage block 38, and oil port five 382 and oil port six 383 respectively on the front surface of the boom cylinder small cavity oil passage block 38. A total of 8 fixing holes 385 are provided on the upper and lower surfaces of the boom cylinder small cavity oil passage block 38. The fixing holes 385 on the lower surface are used to install and fix it to the fixed bracket 37, and the fixing holes 385 on the upper surface are used to fix the boom cylinder large cavity oil passage block 39. The boom cylinder small cavity oil passage block 38 is provided with 12 threaded holes 384 on the surface where each oil port is located, which are used to fix the connection between the end of the hose and the oil port.

[0047] Furthermore, the boom cylinder small-bore steel pipe 31 and the boom cylinder large-bore steel pipe 32 are mounted and fixed to the vehicle frame 1 via steel pipe fixing clamps 33. The middle of the boom cylinder large-bore rubber hose 34 and the boom cylinder small-bore rubber hose 35 is mounted and fixed to the vehicle frame 1 via rubber hose clamps 36. Specifically, the ends of the boom cylinder small-bore steel pipe 31 and the boom cylinder large-bore steel pipe 32 are fixed near the outlets of the two steel pipes via steel pipe fixing clamps 33 to prevent the steel pipes from vibrating.

[0048] like Figure 11 As shown, the fixing bracket 37 is fixed to the bottom plate of the vehicle frame 1 by fixing bolts 310 and washers 311. The fixing bracket 37 is tightened and fixed by fixing bolts 310 and washers 311 to support and fix the boom cylinder small cavity oil block 38 and the boom cylinder large cavity oil block 39.

Claims

1. A hydraulic pipeline structure from a main valve to a boom cylinder of an excavator, comprising a main valve (2) mounted on a vehicle frame (1) and a boom cylinder hinged to the front end of the vehicle frame (1), characterized in that: The main valve (2) is connected to the boom cylinder via a main valve to boom cylinder pipeline assembly (3) and a boom cylinder pipeline (4). The main valve to boom cylinder pipeline assembly (3) comprises a fixed bracket (37) mounted on the vehicle frame (1), a boom cylinder small cavity oil passage block (38) mounted on the fixed bracket (37), and a boom cylinder large cavity oil passage block (39) mounted on the boom cylinder small cavity oil passage block (38). The small cavity oil port of the boom oil cylinder of the main valve (2) is communicated with the oil port seven (381) on the small cavity oil path block (38) of the boom oil cylinder through the small cavity steel pipe (31) of the boom oil cylinder and the small cavity rubber hose (35) of the boom oil cylinder, and the large cavity oil port of the boom oil cylinder of the main valve (2) is communicated with the oil port one (391) on the large cavity oil path block (39) of the boom oil cylinder through the large cavity steel pipe (32) of the boom oil cylinder and the large cavity rubber hose (34) of the boom oil cylinder.

2. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to claim 1 is characterized in that: The boom oil cylinder large cavity oil passage block (39) is provided with an oil port 2 (392) and an oil port 3 (393). The oil port 2 (392) is communicated with the large cavity oil port of the left boom oil cylinder (5) through the boom oil cylinder pipeline (4), and the oil port 3 (393) is communicated with the large cavity oil port of the right boom oil cylinder (6) through the boom oil cylinder pipeline (4). The oil port 1 (391), the oil port 2 (392) and the oil port 3 (393) are communicated through an internal oil passage.

3. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to claim 2 is characterized in that: The boom cylinder large cavity oil passage block (39) is also provided with a countersunk hole (395) for mounting on the boom cylinder small cavity oil passage block (38), a hoisting hole (396) for hoisting, and a threaded hole (397) for fixing the end of the hose and the oil port.

4. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to claim 2, characterized in that: The boom cylinder small chamber oil passage block (38) is provided with an oil port five (382) and an oil port six (383). The oil port five (382) is communicated with the small chamber oil port of the right boom cylinder (6) through the boom cylinder pipeline (4), and the oil port six (383) is communicated with the small chamber oil port of the left boom cylinder (5) through the boom cylinder pipeline (4).

5. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to claim 4 is characterized in that: The boom oil cylinder small chamber oil passage block (38) is also provided with a fixing hole (385) and a second threaded hole (384) for fixing the end of the rubber hose and the oil port.

6. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to any one of claims 1 to 5, characterized in that: The boom cylinder small-cavity steel pipe (31) and the boom cylinder large-cavity steel pipe (32) are mounted and fixed on the vehicle frame (1) via steel pipe fixing clamps (33).

7. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to any one of claims 1 to 5, characterized in that: The large-cavity rubber hose (34) of the boom oil cylinder and the small-cavity rubber hose (35) of the boom oil cylinder are fixed on the vehicle frame (1) via rubber hose clamps (36).

8. The hydraulic pipeline structure from the main valve to the boom cylinder of an excavator according to any one of claims 1 to 5, characterized in that: The fixing bracket (37) is fixed on the bottom plate of the vehicle frame (1) via fixing bolts (310) and washers (311).

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